Jtekt Corporation

Toshihiro Hakata

Takaaki Onizuka

Yuya Inoue

Teruyuki Wakisaka

Takuya Toda

Yoshiyuki Ina

Junji Murata

Toshiyuki Maeda

Hajime Watanabe

Tsuyoshi Okumura

Katsuyuki Harada

Yoshito Takada

Youichi Tsuzaki

Masaru Deguchi

Masaki Maeda

Shinichi Mizuta

A hub unit that is to be installed on a vehicle is provided with: an outer ring having, on the inner circumferential surface, a first outer raceway surface and a second outer raceway surface that is disposed to the outside of the first outer raceway surface in the vehicle width direction when the hub unit is installed on the vehicle; an inner shaft that is disposed on the inside of the outer ring concentrically with the outer ring and on which a wheel is installed on the outer end in the vehicle width direction; and an inner ring that is press-fitted to the inner shaft on the inner end in the vehicle width direction.

Hub unit

Hub unit bearing

A hub unit includes an outer ring, an inner shaft, rolling elements and a sealing device. The outer ring includes an outer ring body and an outer ring flange. The inner shaft includes an inner shaft body and an inner shaft flange. The outer ring body includes a first portion and a second portion. The first portion is an end part on the outer side of the outer ring body. The second portion is a part of the outer ring body between the first portion and the outer ring flange. The second portion includes an upper build-up portion. The upper build-up portion is formed in an upper part of the second portion and a thickness of the build-up portion is larger than thicknesses of side parts of the second portion. An upper end of the upper build-up portion is higher than an upper end of the first portion.

A rolling device for a vehicle includes an inner raceway member including first and second inner raceways; an outer raceway member including first and second outer raceways; first rolling elements disposed rollably between the first inner raceway and the first outer raceway and second rolling elements disposed rollably between the second inner raceway and the second outer raceway; and grease disposed on raceway surfaces of the first inner raceway, the first outer raceway, the second inner raceway, and the second outer raceway and rolling surfaces of the first rolling elements and the second rolling elements. The grease includes a base oil, a thickener, and additives. The grease includes a synthetic oil as the base oil. A kinematic viscosity of the base oil at 40&#xb0; C. is 20 mm/s to 50 mm/s. The additives include a phosphorus compound, a calcium compound, and a hydrocarbon wax.

Rolling device for vehicle

A wheel bearing device includes: an inner shaft; an inner ring; an outer ring; and first and second rolling element groups. The first rolling element group is disposed on the vehicle outer side. The second rolling element group is disposed on the vehicle inner side. The first and second rolling element groups have the same contact angle and the same number of balls. A relationship between a ball diameter D1 of the first rolling element group and a ball diameter D2 of the second rolling element group is set such that an inequality D1&#x3e;D2 is satisfied. A relationship between a pitch circle diameter PCD1 of the first rolling element group and a pitch circle diameter PCD2 of the second rolling element group is set such that an equation PCD1=D1/D2&#xd7;PCD2 is satisfied.

Wheel bearing device

A wheel supporting device includes: a hub unit that has a rotary ring having a first spline on its axially inner end face; and a joint that has an outer ring having a second spline, meshing with the first spline, on its axially outer end face. At least one projection included in a plurality of projections of the first spline projects in the axial direction by a larger amount than the remaining projections of the first spline. When a crest of the at least one projection contacts a crest of one of projections of the second spline, a play is caused between the rotary ring and the outer ring due to the at least one projection that works as a fulcrum.

Wheel supporting device

It is a cage that is formed of a resin and that holds balls serving as rolling elements. The cage includes an annular base portion, and a plurality of claw portions that are formed to be arranged at constant intervals on the circumference of the base portion and to protrude therefrom. A pocket for accommodating the ball is formed between each pair of adjacent ones of the claw portions. In the resin cage for a ball bearing, thinning recesses are formed in end partsof the claw portions and a rear surface of the base portion, respectively.

Resin cage for ball bearing

In an evaluation apparatus of a hub unit, a signal processing unit outputs frequency analysis signals which indicate such a result obtained by that an output signal of an acceleration sensor fixed on a hub unit by a magnet is processed via an A/D converting unit and an envelope detecting unit, and thereafter, the processed sensor signal is analyzed for a frequency analysis by an FFT unit. Then, an evaluation output unit evaluates damage conditions of the hub unit based upon signal strengths of specific frequencies, and overall values, which are acquired from the frequency analysis signals, and then, outputs the evaluated damage condition to a display unit.

Growing community of inventors

Kashiwara, Japan

Toshihiro Hakata